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Introducing FET differential amplifier pair at the input stage of differential amplifier produces

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in Linear Integrated Circuits by (37.1k points)
Introducing FET differential amplifier pair at the input stage of differential amplifier produces

(a) High output resistance

(b) High input resistance

(c) Low input impedance

(d) All of the mentioned

The question was posed to me in unit test.

Asked question is from Operational Amplifier Internal Circuit topic in division Operational Amplifier of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Right option is (b) High input resistance

Simply put: Input resistance of the order 10^12 Ω is possible with JFET at the input stage of differential amplifier.

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